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Convert Renderer::Theme to generic Widget type

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This commit is contained in:
Héctor Ramón Jiménez 2024-01-21 17:56:01 +01:00
parent 545cc909c9
commit 7a50e9e8fb
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GPG key ID: 7CC46565708259A7
88 changed files with 1219 additions and 1153 deletions
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78
core/src/element.rs
View file

@ -23,13 +23,13 @@ use std::borrow::Borrow;
///
/// [built-in widget]: crate::widget
#[allow(missing_debug_implementations)]
pub struct Element<'a, Message, Renderer> {
widget: Box<dyn Widget<Message, Renderer> + 'a>,
pub struct Element<'a, Message, Theme, Renderer> {
widget: Box<dyn Widget<Message, Theme, Renderer> + 'a>,
}
impl<'a, Message, Renderer> Element<'a, Message, Renderer> {
impl<'a, Message, Theme, Renderer> Element<'a, Message, Theme, Renderer> {
/// Creates a new [`Element`] containing the given [`Widget`].
pub fn new(widget: impl Widget<Message, Renderer> + 'a) -> Self
pub fn new(widget: impl Widget<Message, Theme, Renderer> + 'a) -> Self
where
Renderer: crate::Renderer,
{
@ -39,12 +39,14 @@ impl<'a, Message, Renderer> Element<'a, Message, Renderer> {
}
/// Returns a reference to the [`Widget`] of the [`Element`],
pub fn as_widget(&self) -> &dyn Widget<Message, Renderer> {
pub fn as_widget(&self) -> &dyn Widget<Message, Theme, Renderer> {
self.widget.as_ref()
}
/// Returns a mutable reference to the [`Widget`] of the [`Element`],
pub fn as_widget_mut(&mut self) -> &mut dyn Widget<Message, Renderer> {
pub fn as_widget_mut(
&mut self,
) -> &mut dyn Widget<Message, Theme, Renderer> {
self.widget.as_mut()
}
@ -100,7 +102,7 @@ impl<'a, Message, Renderer> Element<'a, Message, Renderer> {
/// # impl Counter {
/// # pub fn view(
/// # &self,
/// # ) -> iced_core::Element<Message, iced_core::renderer::Null> {
/// # ) -> iced_core::Element<Message, (), iced_core::renderer::Null> {
/// # unimplemented!()
/// # }
/// # }
@ -126,7 +128,7 @@ impl<'a, Message, Renderer> Element<'a, Message, Renderer> {
/// #
/// # pub fn push(
/// # mut self,
/// # _: iced_core::Element<Message, iced_core::renderer::Null>,
/// # _: iced_core::Element<Message, (), iced_core::renderer::Null>,
/// # ) -> Self {
/// # unimplemented!()
/// # }
@ -155,7 +157,7 @@ impl<'a, Message, Renderer> Element<'a, Message, Renderer> {
/// Row::new().spacing(20),
/// |row, (index, counter)| {
/// // We display the counter
/// let element: Element<counter::Message, Renderer> =
/// let element: Element<counter::Message, _, _> =
/// counter.view().into();
///
/// row.push(
@ -210,9 +212,10 @@ impl<'a, Message, Renderer> Element<'a, Message, Renderer> {
pub fn map<B>(
self,
f: impl Fn(Message) -> B + 'a,
) -> Element<'a, B, Renderer>
) -> Element<'a, B, Theme, Renderer>
where
Message: 'a,
Theme: 'a,
Renderer: crate::Renderer + 'a,
B: 'a,
{
@ -228,9 +231,10 @@ impl<'a, Message, Renderer> Element<'a, Message, Renderer> {
pub fn explain<C: Into<Color>>(
self,
color: C,
) -> Element<'a, Message, Renderer>
) -> Element<'a, Message, Theme, Renderer>
where
Message: 'static,
Message: 'a,
Theme: 'a,
Renderer: crate::Renderer + 'a,
{
Element {
@ -239,32 +243,34 @@ impl<'a, Message, Renderer> Element<'a, Message, Renderer> {
}
}
impl<'a, Message, Renderer> Borrow<dyn Widget<Message, Renderer> + 'a>
for Element<'a, Message, Renderer>
impl<'a, Message, Theme, Renderer>
Borrow<dyn Widget<Message, Theme, Renderer> + 'a>
for Element<'a, Message, Theme, Renderer>
{
fn borrow(&self) -> &(dyn Widget<Message, Renderer> + 'a) {
fn borrow(&self) -> &(dyn Widget<Message, Theme, Renderer> + 'a) {
self.widget.borrow()
}
}
impl<'a, Message, Renderer> Borrow<dyn Widget<Message, Renderer> + 'a>
for &Element<'a, Message, Renderer>
impl<'a, Message, Theme, Renderer>
Borrow<dyn Widget<Message, Theme, Renderer> + 'a>
for &Element<'a, Message, Theme, Renderer>
{
fn borrow(&self) -> &(dyn Widget<Message, Renderer> + 'a) {
fn borrow(&self) -> &(dyn Widget<Message, Theme, Renderer> + 'a) {
self.widget.borrow()
}
}
struct Map<'a, A, B, Renderer> {
widget: Box<dyn Widget<A, Renderer> + 'a>,
struct Map<'a, A, B, Theme, Renderer> {
widget: Box<dyn Widget<A, Theme, Renderer> + 'a>,
mapper: Box<dyn Fn(A) -> B + 'a>,
}
impl<'a, A, B, Renderer> Map<'a, A, B, Renderer> {
impl<'a, A, B, Theme, Renderer> Map<'a, A, B, Theme, Renderer> {
pub fn new<F>(
widget: Box<dyn Widget<A, Renderer> + 'a>,
widget: Box<dyn Widget<A, Theme, Renderer> + 'a>,
mapper: F,
) -> Map<'a, A, B, Renderer>
) -> Map<'a, A, B, Theme, Renderer>
where
F: 'a + Fn(A) -> B,
{
@ -275,7 +281,8 @@ impl<'a, A, B, Renderer> Map<'a, A, B, Renderer> {
}
}
impl<'a, A, B, Renderer> Widget<B, Renderer> for Map<'a, A, B, Renderer>
impl<'a, A, B, Theme, Renderer> Widget<B, Theme, Renderer>
for Map<'a, A, B, Theme, Renderer>
where
Renderer: crate::Renderer + 'a,
A: 'a,
@ -408,7 +415,7 @@ where
&self,
tree: &Tree,
renderer: &mut Renderer,
theme: &Renderer::Theme,
theme: &Theme,
style: &renderer::Style,
layout: Layout<'_>,
cursor: mouse::Cursor,
@ -435,7 +442,7 @@ where
tree: &'b mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
) -> Option<overlay::Element<'b, B, Renderer>> {
) -> Option<overlay::Element<'b, B, Theme, Renderer>> {
let mapper = &self.mapper;
self.widget
@ -444,22 +451,25 @@ where
}
}
struct Explain<'a, Message, Renderer: crate::Renderer> {
element: Element<'a, Message, Renderer>,
struct Explain<'a, Message, Theme, Renderer: crate::Renderer> {
element: Element<'a, Message, Theme, Renderer>,
color: Color,
}
impl<'a, Message, Renderer> Explain<'a, Message, Renderer>
impl<'a, Message, Theme, Renderer> Explain<'a, Message, Theme, Renderer>
where
Renderer: crate::Renderer,
{
fn new(element: Element<'a, Message, Renderer>, color: Color) -> Self {
fn new(
element: Element<'a, Message, Theme, Renderer>,
color: Color,
) -> Self {
Explain { element, color }
}
}
impl<'a, Message, Renderer> Widget<Message, Renderer>
for Explain<'a, Message, Renderer>
impl<'a, Message, Theme, Renderer> Widget<Message, Theme, Renderer>
for Explain<'a, Message, Theme, Renderer>
where
Renderer: crate::Renderer,
{
@ -524,7 +534,7 @@ where
&self,
state: &Tree,
renderer: &mut Renderer,
theme: &Renderer::Theme,
theme: &Theme,
style: &renderer::Style,
layout: Layout<'_>,
cursor: mouse::Cursor,
@ -578,7 +588,7 @@ where
state: &'b mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
) -> Option<overlay::Element<'b, Message, Renderer>> {
) -> Option<overlay::Element<'b, Message, Theme, Renderer>> {
self.element.widget.overlay(state, layout, renderer)
}
}

4
core/src/layout/flex.rs
View file

@ -59,7 +59,7 @@ impl Axis {
/// padding and alignment to the items as needed.
///
/// It returns a new layout [`Node`].
pub fn resolve<Message, Renderer>(
pub fn resolve<Message, Theme, Renderer>(
axis: Axis,
renderer: &Renderer,
limits: &Limits,
@ -68,7 +68,7 @@ pub fn resolve<Message, Renderer>(
padding: Padding,
spacing: f32,
align_items: Alignment,
items: &[Element<'_, Message, Renderer>],
items: &[Element<'_, Message, Theme, Renderer>],
trees: &mut [widget::Tree],
) -> Node
where

12
core/src/overlay.rs
View file

@ -14,7 +14,7 @@ use crate::widget::Tree;
use crate::{Clipboard, Layout, Point, Rectangle, Shell, Size, Vector};
/// An interactive component that can be displayed on top of other widgets.
pub trait Overlay<Message, Renderer>
pub trait Overlay<Message, Theme, Renderer>
where
Renderer: crate::Renderer,
{
@ -36,7 +36,7 @@ where
fn draw(
&self,
renderer: &mut Renderer,
theme: &Renderer::Theme,
theme: &Theme,
style: &renderer::Style,
layout: Layout<'_>,
cursor: mouse::Cursor,
@ -106,7 +106,7 @@ where
&'a mut self,
_layout: Layout<'_>,
_renderer: &Renderer,
) -> Option<Element<'a, Message, Renderer>> {
) -> Option<Element<'a, Message, Theme, Renderer>> {
None
}
}
@ -115,12 +115,12 @@ where
///
/// This method will generally only be used by advanced users that are
/// implementing the [`Widget`](crate::Widget) trait.
pub fn from_children<'a, Message, Renderer>(
children: &'a mut [crate::Element<'_, Message, Renderer>],
pub fn from_children<'a, Message, Theme, Renderer>(
children: &'a mut [crate::Element<'_, Message, Theme, Renderer>],
tree: &'a mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
) -> Option<Element<'a, Message, Renderer>>
) -> Option<Element<'a, Message, Theme, Renderer>>
where
Renderer: crate::Renderer,
{

35
core/src/overlay/element.rs
View file

@ -11,20 +11,20 @@ use std::any::Any;
/// A generic [`Overlay`].
#[allow(missing_debug_implementations)]
pub struct Element<'a, Message, Renderer> {
pub struct Element<'a, Message, Theme, Renderer> {
position: Point,
translation: Vector,
overlay: Box<dyn Overlay<Message, Renderer> + 'a>,
overlay: Box<dyn Overlay<Message, Theme, Renderer> + 'a>,
}
impl<'a, Message, Renderer> Element<'a, Message, Renderer>
impl<'a, Message, Theme, Renderer> Element<'a, Message, Theme, Renderer>
where
Renderer: crate::Renderer,
{
/// Creates a new [`Element`] containing the given [`Overlay`].
pub fn new(
position: Point,
overlay: Box<dyn Overlay<Message, Renderer> + 'a>,
overlay: Box<dyn Overlay<Message, Theme, Renderer> + 'a>,
) -> Self {
Self {
position,
@ -46,9 +46,13 @@ where
}
/// Applies a transformation to the produced message of the [`Element`].
pub fn map<B>(self, f: &'a dyn Fn(Message) -> B) -> Element<'a, B, Renderer>
pub fn map<B>(
self,
f: &'a dyn Fn(Message) -> B,
) -> Element<'a, B, Theme, Renderer>
where
Message: 'a,
Theme: 'a,
Renderer: 'a,
B: 'a,
{
@ -104,7 +108,7 @@ where
pub fn draw(
&self,
renderer: &mut Renderer,
theme: &Renderer::Theme,
theme: &Theme,
style: &renderer::Style,
layout: Layout<'_>,
cursor: mouse::Cursor,
@ -137,26 +141,27 @@ where
&'b mut self,
layout: Layout<'_>,
renderer: &Renderer,
) -> Option<Element<'b, Message, Renderer>> {
) -> Option<Element<'b, Message, Theme, Renderer>> {
self.overlay.overlay(layout, renderer)
}
}
struct Map<'a, A, B, Renderer> {
content: Box<dyn Overlay<A, Renderer> + 'a>,
struct Map<'a, A, B, Theme, Renderer> {
content: Box<dyn Overlay<A, Theme, Renderer> + 'a>,
mapper: &'a dyn Fn(A) -> B,
}
impl<'a, A, B, Renderer> Map<'a, A, B, Renderer> {
impl<'a, A, B, Theme, Renderer> Map<'a, A, B, Theme, Renderer> {
pub fn new(
content: Box<dyn Overlay<A, Renderer> + 'a>,
content: Box<dyn Overlay<A, Theme, Renderer> + 'a>,
mapper: &'a dyn Fn(A) -> B,
) -> Map<'a, A, B, Renderer> {
) -> Map<'a, A, B, Theme, Renderer> {
Map { content, mapper }
}
}
impl<'a, A, B, Renderer> Overlay<B, Renderer> for Map<'a, A, B, Renderer>
impl<'a, A, B, Theme, Renderer> Overlay<B, Theme, Renderer>
for Map<'a, A, B, Theme, Renderer>
where
Renderer: crate::Renderer,
{
@ -269,7 +274,7 @@ where
fn draw(
&self,
renderer: &mut Renderer,
theme: &Renderer::Theme,
theme: &Theme,
style: &renderer::Style,
layout: Layout<'_>,
cursor: mouse::Cursor,
@ -290,7 +295,7 @@ where
&'b mut self,
layout: Layout<'_>,
renderer: &Renderer,
) -> Option<Element<'b, B, Renderer>> {
) -> Option<Element<'b, B, Theme, Renderer>> {
self.content
.overlay(layout, renderer)
.map(|overlay| overlay.map(self.mapper))

38
core/src/overlay/group.rs
View file

@ -11,14 +11,15 @@ use crate::{
/// An [`Overlay`] container that displays multiple overlay [`overlay::Element`]
/// children.
#[allow(missing_debug_implementations)]
pub struct Group<'a, Message, Renderer> {
children: Vec<overlay::Element<'a, Message, Renderer>>,
pub struct Group<'a, Message, Theme, Renderer> {
children: Vec<overlay::Element<'a, Message, Theme, Renderer>>,
}
impl<'a, Message, Renderer> Group<'a, Message, Renderer>
impl<'a, Message, Theme, Renderer> Group<'a, Message, Theme, Renderer>
where
Renderer: 'a + crate::Renderer,
Message: 'a,
Theme: 'a,
Renderer: 'a + crate::Renderer,
{
/// Creates an empty [`Group`].
pub fn new() -> Self {
@ -27,7 +28,7 @@ where
/// Creates a [`Group`] with the given elements.
pub fn with_children(
children: Vec<overlay::Element<'a, Message, Renderer>>,
children: Vec<overlay::Element<'a, Message, Theme, Renderer>>,
) -> Self {
Group { children }
}
@ -35,30 +36,32 @@ where
/// Adds an [`overlay::Element`] to the [`Group`].
pub fn push(
mut self,
child: impl Into<overlay::Element<'a, Message, Renderer>>,
child: impl Into<overlay::Element<'a, Message, Theme, Renderer>>,
) -> Self {
self.children.push(child.into());
self
}
/// Turns the [`Group`] into an overlay [`overlay::Element`].
pub fn overlay(self) -> overlay::Element<'a, Message, Renderer> {
pub fn overlay(self) -> overlay::Element<'a, Message, Theme, Renderer> {
overlay::Element::new(Point::ORIGIN, Box::new(self))
}
}
impl<'a, Message, Renderer> Default for Group<'a, Message, Renderer>
impl<'a, Message, Theme, Renderer> Default
for Group<'a, Message, Theme, Renderer>
where
Renderer: 'a + crate::Renderer,
Message: 'a,
Theme: 'a,
Renderer: 'a + crate::Renderer,
{
fn default() -> Self {
Self::with_children(Vec::new())
}
}
impl<'a, Message, Renderer> Overlay<Message, Renderer>
for Group<'a, Message, Renderer>
impl<'a, Message, Theme, Renderer> Overlay<Message, Theme, Renderer>
for Group<'a, Message, Theme, Renderer>
where
Renderer: crate::Renderer,
{
@ -106,7 +109,7 @@ where
fn draw(
&self,
renderer: &mut Renderer,
theme: &<Renderer as crate::Renderer>::Theme,
theme: &Theme,
style: &renderer::Style,
layout: Layout<'_>,
cursor: mouse::Cursor,
@ -166,7 +169,7 @@ where
&'b mut self,
layout: Layout<'_>,
renderer: &Renderer,
) -> Option<overlay::Element<'b, Message, Renderer>> {
) -> Option<overlay::Element<'b, Message, Theme, Renderer>> {
let children = self
.children
.iter_mut()
@ -178,13 +181,14 @@ where
}
}
impl<'a, Message, Renderer> From<Group<'a, Message, Renderer>>
for overlay::Element<'a, Message, Renderer>
impl<'a, Message, Theme, Renderer> From<Group<'a, Message, Theme, Renderer>>
for overlay::Element<'a, Message, Theme, Renderer>
where
Renderer: 'a + crate::Renderer,
Message: 'a,
Theme: 'a,
Renderer: 'a + crate::Renderer,
{
fn from(group: Group<'a, Message, Renderer>) -> Self {
fn from(group: Group<'a, Message, Theme, Renderer>) -> Self {
group.overlay()
}
}

3
core/src/renderer.rs
View file

@ -9,9 +9,6 @@ use crate::{Background, Border, Color, Rectangle, Shadow, Size, Vector};
/// A component that can be used by widgets to draw themselves on a screen.
pub trait Renderer: Sized {
/// The supported theme of the [`Renderer`].
type Theme;
/// Draws the primitives recorded in the given closure in a new layer.
///
/// The layer will clip its contents to the provided `bounds`.

2
core/src/renderer/null.rs
View file

@ -19,8 +19,6 @@ impl Null {
}
impl Renderer for Null {
type Theme = ();
fn with_layer(&mut self, _bounds: Rectangle, _f: impl FnOnce(&mut Self)) {}
fn with_translation(

6
core/src/widget.rs
View file

@ -39,7 +39,7 @@ use crate::{Clipboard, Length, Rectangle, Shell, Size};
/// [`geometry`]: https://github.com/iced-rs/iced/tree/0.10/examples/geometry
/// [`lyon`]: https://github.com/nical/lyon
/// [`iced_wgpu`]: https://github.com/iced-rs/iced/tree/0.10/wgpu
pub trait Widget<Message, Renderer>
pub trait Widget<Message, Theme, Renderer>
where
Renderer: crate::Renderer,
{
@ -70,7 +70,7 @@ where
&self,
tree: &Tree,
renderer: &mut Renderer,
theme: &Renderer::Theme,
theme: &Theme,
style: &renderer::Style,
layout: Layout<'_>,
cursor: mouse::Cursor,
@ -146,7 +146,7 @@ where
_state: &'a mut Tree,
_layout: Layout<'_>,
_renderer: &Renderer,
) -> Option<overlay::Element<'a, Message, Renderer>> {
) -> Option<overlay::Element<'a, Message, Theme, Renderer>> {
None
}
}

45
core/src/widget/text.rs
View file

@ -15,10 +15,10 @@ pub use text::{LineHeight, Shaping};
/// A paragraph of text.
#[allow(missing_debug_implementations)]
pub struct Text<'a, Renderer>
pub struct Text<'a, Theme, Renderer>
where
Theme: StyleSheet,
Renderer: text::Renderer,
Renderer::Theme: StyleSheet,
{
content: Cow<'a, str>,
size: Option<Pixels>,
@ -29,13 +29,13 @@ where
vertical_alignment: alignment::Vertical,
font: Option<Renderer::Font>,
shaping: Shaping,
style: <Renderer::Theme as StyleSheet>::Style,
style: Theme::Style,
}
impl<'a, Renderer> Text<'a, Renderer>
impl<'a, Theme, Renderer> Text<'a, Theme, Renderer>
where
Theme: StyleSheet,
Renderer: text::Renderer,
Renderer::Theme: StyleSheet,
{
/// Create a new fragment of [`Text`] with the given contents.
pub fn new(content: impl Into<Cow<'a, str>>) -> Self {
@ -74,10 +74,7 @@ where
}
/// Sets the style of the [`Text`].
pub fn style(
mut self,
style: impl Into<<Renderer::Theme as StyleSheet>::Style>,
) -> Self {
pub fn style(mut self, style: impl Into<Theme::Style>) -> Self {
self.style = style.into();
self
}
@ -123,10 +120,11 @@ where
#[derive(Debug, Default)]
pub struct State<P: Paragraph>(P);
impl<'a, Message, Renderer> Widget<Message, Renderer> for Text<'a, Renderer>
impl<'a, Message, Theme, Renderer> Widget<Message, Theme, Renderer>
for Text<'a, Theme, Renderer>
where
Theme: StyleSheet,
Renderer: text::Renderer,
Renderer::Theme: StyleSheet,
{
fn tag(&self) -> tree::Tag {
tree::Tag::of::<State<Renderer::Paragraph>>()
@ -169,7 +167,7 @@ where
&self,
tree: &Tree,
renderer: &mut Renderer,
theme: &Renderer::Theme,
theme: &Theme,
style: &renderer::Style,
layout: Layout<'_>,
_cursor_position: mouse::Cursor,
@ -272,21 +270,23 @@ pub fn draw<Renderer>(
);
}
impl<'a, Message, Renderer> From<Text<'a, Renderer>>
for Element<'a, Message, Renderer>
impl<'a, Message, Theme, Renderer> From<Text<'a, Theme, Renderer>>
for Element<'a, Message, Theme, Renderer>
where
Theme: StyleSheet + 'a,
Renderer: text::Renderer + 'a,
Renderer::Theme: StyleSheet,
{
fn from(text: Text<'a, Renderer>) -> Element<'a, Message, Renderer> {
fn from(
text: Text<'a, Theme, Renderer>,
) -> Element<'a, Message, Theme, Renderer> {
Element::new(text)
}
}
impl<'a, Renderer> Clone for Text<'a, Renderer>
impl<'a, Theme, Renderer> Clone for Text<'a, Theme, Renderer>
where
Theme: StyleSheet,
Renderer: text::Renderer,
Renderer::Theme: StyleSheet,
{
fn clone(&self) -> Self {
Self {
@ -304,20 +304,21 @@ where
}
}
impl<'a, Renderer> From<&'a str> for Text<'a, Renderer>
impl<'a, Theme, Renderer> From<&'a str> for Text<'a, Theme, Renderer>
where
Theme: StyleSheet,
Renderer: text::Renderer,
Renderer::Theme: StyleSheet,
{
fn from(content: &'a str) -> Self {
Self::new(content)
}
}
impl<'a, Message, Renderer> From<&'a str> for Element<'a, Message, Renderer>
impl<'a, Message, Theme, Renderer> From<&'a str>
for Element<'a, Message, Theme, Renderer>
where
Theme: StyleSheet + 'a,
Renderer: text::Renderer + 'a,
Renderer::Theme: StyleSheet,
{
fn from(content: &'a str) -> Self {
Text::from(content).into()

12
core/src/widget/tree.rs
View file

@ -31,8 +31,8 @@ impl Tree {
}
/// Creates a new [`Tree`] for the provided [`Widget`].
pub fn new<'a, Message, Renderer>(
widget: impl Borrow<dyn Widget<Message, Renderer> + 'a>,
pub fn new<'a, Message, Theme, Renderer>(
widget: impl Borrow<dyn Widget<Message, Theme, Renderer> + 'a>,
) -> Self
where
Renderer: crate::Renderer,
@ -54,9 +54,9 @@ impl Tree {
/// Otherwise, the whole [`Tree`] is recreated.
///
/// [`Widget::diff`]: crate::Widget::diff
pub fn diff<'a, Message, Renderer>(
pub fn diff<'a, Message, Theme, Renderer>(
&mut self,
new: impl Borrow<dyn Widget<Message, Renderer> + 'a>,
new: impl Borrow<dyn Widget<Message, Theme, Renderer> + 'a>,
) where
Renderer: crate::Renderer,
{
@ -68,9 +68,9 @@ impl Tree {
}
/// Reconciles the children of the tree with the provided list of widgets.
pub fn diff_children<'a, Message, Renderer>(
pub fn diff_children<'a, Message, Theme, Renderer>(
&mut self,
new_children: &[impl Borrow<dyn Widget<Message, Renderer> + 'a>],
new_children: &[impl Borrow<dyn Widget<Message, Theme, Renderer> + 'a>],
) where
Renderer: crate::Renderer,
{